\[\left(\left(3 + \frac{2}{r \cdot r}\right) - \frac{\left(0.125 \cdot \left(3 - 2 \cdot v\right)\right) \cdot \left(\left(\left(w \cdot w\right) \cdot r\right) \cdot r\right)}{1 - v}\right) - 4.5\]

\left(\left(3 + \frac{2}{r \cdot r}\right) - \frac{\left(0.125 \cdot \left(3 - 2 \cdot v\right)\right) \cdot \left(\left(\left(w \cdot w\right) \cdot r\right) \cdot r\right)}{1 - v}\right) - 4.5

double f(double v, double w, double r) {
        double r8107 = 3.0;
        double r8108 = 2.0;
        double r8109 = r;
        double r8110 = r8109 * r8109;
        double r8111 = r8108 / r8110;
        double r8112 = r8107 + r8111;
        double r8113 = 0.125;
        double r8114 = v;
        double r8115 = r8108 * r8114;
        double r8116 = r8107 - r8115;
        double r8117 = r8113 * r8116;
        double r8118 = w;
        double r8119 = r8118 * r8118;
        double r8120 = r8119 * r8109;
        double r8121 = r8120 * r8109;
        double r8122 = r8117 * r8121;
        double r8123 = 1.0;
        double r8124 = r8123 - r8114;
        double r8125 = r8122 / r8124;
        double r8126 = r8112 - r8125;
        double r8127 = 4.5;
        double r8128 = r8126 - r8127;
        return r8128;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019179 
(FPCore (v w r)
  :name "Rosa's TurbineBenchmark"
  (- (- (+ 3.0 (/ 2.0 (* r r))) (/ (* (* 0.125 (- 3.0 (* 2.0 v))) (* (* (* w w) r) r)) (- 1.0 v))) 4.5))

Backtrace

result arity mismatch; expected number of values not received expected: 2 received: 1 in: local-binding form values...: 0		L	C
loop	/data/pavpan/nightlies/herbie/various-cleanup/src/core/extraction.rkt	25	2
(unnamed)	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	26	0
simplify!	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	217	0
run-improve43	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	339	0
(unnamed)	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	261	28
run	/opt/racket-7.0/share/pkgs/profile-lib/main.rkt	39	2
profile-thunk16	/opt/racket-7.0/share/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	261	28